Types of Charging

Charging means gaining or losing electron. Matters can be charged with three ways, charging by friction, charging by contact and charging by induction.

Charging by Friction

When you rub one material to another, they are charged by friction. Material losing electron is positively charged and material gaining electron is negatively charged. Amount of gained and lost electron is equal to each other. In other words, we can say that charges of the system are conserved. When you rub glass rod to a silk, glass lose electron and positively charged and silk gain electron and negatively charged.

charging by friction








 

Charging by Contact

There are equal numbers of electrons and protons in a neutral matter. If something changes this balance we can say it is charged. Look at the following picture;

charging by contact

 

 

 

 

 

In this picture, negatively charged rod touches to the neutral sphere and some of the electrons pass to the sphere. As a result neutral sphere is charged by contact. If the rod is positively charged, then some of the electrons of sphere pass to the rod and when we separate them, sphere becomes positively charged. Picture given below shows the flow of electrons from sphere to the rod.

charging by contact






1. When charged object touches to a neutral object, they both have same charge.

2. When two charged matter touch each other, total charge of the system is conserved and they share the total charge according to their capacities. If they have same amount of different charges, when we touch one another they become neutral. If the amount of charges is different then, after flow of charge they are both negatively or positively charged. Having opposite charges after contact is impossible.

3. If the touching objects are spheres, they share the total charge according to their radii, because their capacities are directly proportional to their radius. When the spheres are identical then they share total charge equally.

4. We can find the charge per radius by the following equation;

charging equation




Then we use following equation to find the charge per spheres having radii r1 and r2;

 

charging equation

 

 

 

Example: Charged spheres having radiuses 3r, 2r and r have different charges. If we touch three spheres to each other, find the final charges of the spheres.

electrostatic example

 

 


 

  

electrostatic example solution

 

 

 

 

 

 

 

 

 

 

 

 

  

 

Charging by Induction

We can also charge conductors without contact. Examine the given picture, it shows this type of charging.

charging by induction

 

 

 

A and B conductors are neutral at the beginning. When we put a positively charged plate near them, it attracts the electrons in the conductors. Electrons move to the left part and protons stays. Thus, when we separate plates A and B they are charged by induction, A is negatively charged and B is negatively charged. Be careful, there is no contact, they are charged only by induction.

Electrostatics Exams and Solutions

Related

examples of when charging by friction can be a problem
types of charging an object
when charged sphere contact and separate
Types of Charging + induction
POSITIVELY CHARGING material by induction
types of charged spheres
if we rub one material example
induction charging material types
what is an example of friction, contact, and induction
can conductors charge by friction
when charging by contact, charges become same
types of charging by induction
equally charging spheres by induction
tyoes of charging
charge speres touching formula
charging by friction induction, contact
electric sphere charges touch and seperate physics tutorial
sperate charged spheres
inductive charging formula
inductive charging equation
charging by touching
three spheres in touch charge by induction
Charged spheres having radiuses 3r, 2r and r have different charges If we touch three spheres to each other, find the final charges of the spheres
3 types of charging objects electrostatics
two types of charging electrostatics
formula induction charging
contacting charged spheres
touching charged spheres
charging material, skip charge
physics if one touches another , how much charge
CHARGE OF TWO SPHERE AFTER TOUCHING
+types of charging
types of charging- physics
2 charged spheres touch
three kinds of charging in physics
charged spheres touch each other
charging a material in physics
calculate the charge of 2 touching spheres
two charged spheres are touch and then seperatedwhat are final charges?
what is an example of induction in charge
Types of Charge induction
losing electron on different types of material
what is charge of two spheres after touching each other
other types of charging
physics of material charging
example of charging by friction formula
picture of charging i touch
charging object by touch
electrons equals protons
2 charged spheres physics force